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Feline leukemia virus (FeLV) is a retroviral infection that is a common concern in our pet cats and in feral cat populations. It is a disease that results in an impaired immune system that can effect many body systems (for example causing anemia, mouth inflammation, development of lymphoma, reproductive problems). FeLV is transmitted from cat to cat most often through saliva (including bite wounds or shared grooming), but transmission also may occur through blood, nasal secretions, feces, and milk. The prognosis for infection and development of secondary complications is poor with patients generally becoming ill in months to several years.